Introduction

Sejny is a town in the north-eastern part of Podlasia region, surrounded
by hill, forests, and lakes. Sejny is situated just 10 kilometres from
the Ogrodniki - border crossing with Lithuania. The borders with Bielarus
and Russia (Kaliningrad Region) are near too. The town was founded by Jerzy
Grodziński, lord of neighbouring lands, at the turn of the 16th and 17th
centuries. Initially the name of the town was Juriewo, but it was not accepted,
and finally it got the name Sejny after the Sejna River (at present the
Marycha River).
Today there are Poles, Lithuanians, and Russian Old-believers. The
town was also inhabited by Belarusians, Jews, Germans, Tatars, and Gypsies.
Source: this
website.
Jarig Bakker, 19 Oct 2000

Sejny city new flag

The flag of Sejny seems to have been changed, see this
website. Image: see above.
Jarig Bakker, 10 Jul 2002